package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * @author 杨振华
 * @since 2023/7/18
 */
@Service
@Slf4j
public class UserServiceImpl implements UserService {

    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Resource
    private WeChatProperties weChatProperties;

    @Resource
    private UserMapper userMapper;

    /**
     * wx登录
     *
     * @param userLoginDTO 用户登录dto
     * @return {@link User}
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        // 调用微信接口服务，获得当前用户的openID
        String openid = getUserOpenID(userLoginDTO);

        // 判断openID
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 判断用户是否为新用户
        User user = userMapper.getByOpenId(openid);

        // 新用户自动完成注册
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        // 返回用户对象
        return user;
    }

    /**
     * 得到用户openid
     *
     * @param userLoginDTO 用户登录dto
     * @return {@link String}
     */
    private String getUserOpenID(UserLoginDTO userLoginDTO) {
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
